我也遇到了同样的错误。在我来说，我曾在验证链提供额外的CA证书。和而不是提供的证书，并在不同的文件的关键，我在一个.pem文件将它们结合在一起。

I also came across the same error. In my case I had to supply additional CA certificates in the verification chain. And instead of supplying the certificate and the key in separate files, I combined them in a .pem file.

然而，当你做到这一点，密钥和证书，加上中间一（S）的顺序很重要。正确的顺序：

However, when you do this, the order of the key and the certificate plus the intermediate one(s) is important. The correct order:

your private key
your certificate
(intermediate) CA certificate lowest in the hierarchy
other CA certificates higher in the hierarchy...
(intermediate) CA certificate highest in the hierarchy